In a video shared by the Prisoners for Palestine protest group, Thunberg, 22, can be seen holding a sign reading, “I support the Palestine Action prisoners. I oppose genocide.”

Thunberg, 22, joined a protest Tuesday morning that opposed the treatment of people being held in prisons before trials relating to Palestine Action activities.

London police arrested Swedish activist Greta Thunberg on Tuesday for holding a protest sign supporting Palestine Action hunger strikers.

Officials said two people were arrested for 'throwing red paint on a building' while a 22-year-old woman was nabbed for "displaying a placard in support of the Palestine Action" protest group.

NSW Premier Chris Minns will rush to recall parliament next week to pass a suite of protest restrictions banning rallies after terror attacks, as pressure mounts on Anthony Albanese to introduce similar laws.